Introduction With increasing technology, the requirements on the performance of rolling element bearings become more demanding. These types of bearings are used in such applications as computer hard disk drives, which require nanometer level error motion tolerances. In order to measure the error motions of rolling element bearings, the Bearing Analyzer was manufactured with a very precise air b...

The purpose of this work is to use 3D finite element analyses to compute bending of a hard disk suspension using a laser. The pitch and roll of the suspension can be precisely adjusted by producing a controlled amount of residual strain using the laser as a heat source. In the computational model, an uncoupled thermo-mechanical analysis is applied to calculate the laser induced thermal loading ...

Information. An increasingly difficult and important term to define. Central to the concept is that there are aspects of reality which need to be characterized not in terms of matter or energy but rather in terms of the particular organized forms taken by one or the other or both. Similar information, for example, can be embodied as signals in motions of the air (sound waves), ink on a page (pr...

With the introduction of future multimedia services such as HDTV, digital systems able to store and retrieve a huge amount of video and audio information will play an important role. One of the key problems is the multimedia data access optimization. In this paper we compare several techniques proposed for storage of multimedia information on the hard disk and introduce a Disk Partitioning Tech...

This paper presents a multirate H 1 optimal digital redesign of continuous time controllers. It focuses on the performance of the closed loop system under digital control. The resulting approximation criterion is a measure for stability of the control system. The discrete time controller is obtained through minimization of this criterion , which can be performed with standard software used for ...

With the development of information technology, quick rate of data transfer and high capacity of data storage are expected for advanced recording media. Although data storage media and technique have been developed from soft discs, hard disk, CD-ROM and DVDROM to multi-layered blue-ray discs, undoubtedly, holography is one of the most fascinating and attractive techniques. As shown in Figure 1,...

Noises with tonal components, howling sounds, and modulated signals are often the cause of customer complaints when emitted from technical products. The perception and evaluation of sound events containing such components has become increasingly important, e.g., in the field of vehicle acoustics for the assessment of tonality due to alternative drives. Furthermore, Information Technology (IT) d...

In this paper, an adaptive controller is investigated for a class of uncertain single-input-single-output nonlinear systems preceded by an unknown backlash-type hysteresis nonlinearity, which is modeled by a differential equation. Backstepping design procedure is employed to construct the control input and adaptation laws. A new algorithm is designed to reduce the computational burden compared ...

High bit densities have been demonstrated in longitudinal as well as in perpendicular magnetic recording. For the latter an area density of more than 12 G b i t / i n 2 has been obtained in a sputtered C o C r T a hard disk with a soft magnetic underlayer recorded with a special single pole head. In this paper the role of microstructure and morphology in relation to the compositional separation...

In hard disk drive manufacturing, the tolerance ring is commonly used for coupling a bearing cartridge to an arm actuator. Further, the tolerance ring can prevent slippage between the arm actuator and bearing assembly during operation of disk drive or during shock events. The metal scratch occurred in the tolerance ring installation process cause a number of particles. The main purpose of this ...